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John Deere Tractors Discussion Forum
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need help with injection line leaks

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'71 3020

10-11-2006 23:27:06




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I can't even look at fuel injection lines without them leaking. Two tractors are giving me fits. one is a 4230 with Roosa-Master pencil nozzels, the other is an early 4430 with Bosch KDL nozzels. I just rebuilt/replaced injectors on both. After reinstalling the lines, I have leaks at the injector end of several lines. On the 4430, they don't show up until the engine has been worked hard, then I get a damp spot around the top of the injector. The 4230 has a steady drip with the engine idling. I've tryed tightening the connections on both a little at a time with no luck. I can't see anything wrong with the ends of the lines, I don't see any dirt or paint chips. I even bought one new line for the 4230, which didn't totally cure the problem. The 4230 has brand new nozzels. Any tips?

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430WLPG

10-12-2006 18:33:35




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 Re: need help with injection line leaks in reply to '71 3020, 10-11-2006 23:27:06  
3020 there's a old trick that usually works for me,Start the engine and with it running and leaking LOOSEN the nut that is leaking just enough to make it squirt a little fuel then retighten,( KEEP HANDS AND FINGERS WAY AWAY FROM THE SQUIRTING FUEL) What this does is it washes that airborn dust out of the connection. Worth a try



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msb

10-12-2006 07:56:01




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 Re: need help with injection line leaks in reply to '71 3020, 10-11-2006 23:27:06  
Its usually dirt and dust floating in the air that is attracted to the traces of fuel and/or oil on the fittings and nozzles that causes these leaks.(I used to demonstrate to customers exactly how much dust and dirt is in the air by dipping a clean piece of glass in diesel fuel,then holding the glass in the air for a few seconds.They were always amazed at how quickly dirt was attracted to the fuel.).I have always used a small amount of John Deere paint thinner to cut the fuel residue from the parts.Then I blow all parts off with compressed air.That leaves the surfaces clean,dry and residue free. Then the parts will no longer attract the dust and dirt in the air. I have rarely had a leak after doing this for the last 45 years.Just be sure to blow all the thinner dry.Using a small amount of JD paint thinner to do this has never caused a problem for me.
Another thing that causes lines and fittings to leak is tightening lines that have a slight misalignment to them.Then vibration backs the torqued fitting back off and then you have a leak.That is why it so important for line clamps to be reinstalled and be sure the lines don't move when they are tightened. I have also found that when using those little stamped out gaskets(washers-T20055T) they will seal much better if the cupped sides face each other.

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G/MAN

10-12-2006 07:54:04




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 Re: need help with injection line leaks in reply to '71 3020, 10-11-2006 23:27:06  
Overtightening them probably won't help. In fact, it may make a bad situation worse. If the lines were overtightened at some time in the past, the tips of the lines that seat in the nozzle inlet may be distorted or damaged. The torque spec on those line nuts for the KDL nozzles is around 22 lb.-ft. I'm not sure on the Stanadyne nozzles right off hand, but it's probably a similar amount - double-check though. If everything is in the proper condition and clean, that amount of torque will seal them up fine. Take the lines loose, clean out the area with aerosol brake clean or something similar, get yourself a torque wrench and weatherhead fitting and torque them to the proper specs. Also, on the pencil nozzles, did you replace the seals in the nuts for the return line? Make sure the fuel is running down from that area and showing up as a drip somewhere else. Something is screwy here, because I've had hundreds of nozzles in and out of Deere engines - both styles - and can count on one hand the number of problems I've had with injection lines sealing at the nozzles. Very odd that you would have some much trouble with several on two different tractors.

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cannonball

10-13-2006 05:20:57




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 Re: need help with injection line leaks in reply to G/MAN, 10-12-2006 07:54:04  
I noticed that you and post above was using something to clean diesel parts, one the best things i have found is starting fluid.. it will clean up diesel (if trying to find leak) real fast and dry real fast..if people saw how good it cut oil then they would use it a little less in trying to start their engines..lol have nice day


MAY GOD BLESS THE USA



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ET

10-12-2006 07:24:45




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 Re: need help with injection line leaks in reply to '71 3020, 10-11-2006 23:27:06  
It can help to leave the injector loose in the head until after you hook up the fuel lines. This allows the lines to line up more squarly with the seat in the injector fitting. Torque the injector after the lines are snuged up on them.



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buickanddeere

10-12-2006 03:22:30




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 Re: need help with injection line leaks in reply to '71 3020, 10-11-2006 23:27:06  
Don't look for leaks when she's running by using your fingers or eyes. Fluid injection into your flesh is a problem.



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Bob

10-11-2006 23:40:55




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 Re: need help with injection line leaks in reply to '71 3020, 10-11-2006 23:27:06  
Are you tightening those lines so darn tight, you think they'll break? If not, tighten them up some more!



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